Question

(a) State the position of hyrogen in the periodic table.

(b) Explain its resemblance to the other members of its group.

Answer 1

(a) The position of hydrogen in the periodic table

Hydrogen is first element in the periodic table. It has an atomic number l and an atomic mass of 1.00794 amu, occupying group – IA. Its position is peculiar because it is grouped with metals although it is a non-metal properties. Hydrogen relate to Group IA as well as Group VII A.

(b) The properties of hydrogen resemble the properties of Group IA elements (Alkali metals), and some of it resembles the properties of Halogens (VIIA), so Hydrogen was put at the top of the periodic table so that the symmetry of the modern periodic table is not disturbed.

1. All elements in Group- IA have one electron in outermost shell, so they havevalency one.
2. These elements in Group-IA are good reducing agents.
3. All elements of this group forms oxide which are highly basic and dissolves in water to form strong alkalis.
4. They impart colour to a flame.